81428316 has 24 divisors (see below), whose sum is σ = 192837120. Its totient is φ = 26737392.

The previous prime is 81428309. The next prime is 81428323. The reversal of 81428316 is 61382418.

It is an interprime number because it is at equal distance from previous prime (81428309) and next prime (81428323).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49836 + ... + 51443.

It is an arithmetic number, because the mean of its divisors is an integer number (8034880).

Almost surely, 2^81428316 is an apocalyptic number.

It is an amenable number.

81428316 is an abundant number, since it is smaller than the sum of its proper divisors (111408804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81428316 is a wasteful number, since it uses less digits than its factorization.

81428316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101353 (or 101351 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 81428316 is about 9023.7639596789. The cubic root of 81428316 is about 433.4361709906.

The spelling of 81428316 in words is "eighty-one million, four hundred twenty-eight thousand, three hundred sixteen".